Signals produced by Rhizobium leguminosarum in the interaction with common bean (Phaseolus vulgaris L.)
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Abstract
on a complex signal exchange that continues throughout
the entire symbiotic process, out of which just the correct
combination will give rise to an efficient symbiosis. These
plants secrete flavonoids that are recognized by compatible
bacteria inducing their nod genes, which encode proteins
that synthesize and export lipochitooligosaccharides called
Nod factors. These factors activate infection process and
initiate cell division in the root until making up the nodule
and also participate in nitrogen biological fixation. There
is evidence that the use of nod gene inducers increases
some legume nodulation. The objective of this work was
to study the production of some signal molecules induced
by genistein isoflavon in a R. leguminosarum strain as well
as to evaluate induction impact on inoculum effect upon
common bean plants. Inoculum lipid fraction was isolated
with n-butanol and analyzed by thin layer chromatography,
high performance liquid chromatography and gas
chromatography coupled to a mass spectrometer. Regarding
the inocula induced with genistein, a higher amount of
lipooligosaccharides (Nod factors) and high-molecularweight
fatty acids were detected, showing significant
differences with non-induced controls. Concerning such
signal molecule enrichment, genistein-induced inocula had
a positive effect on “Cubacueto 25-9” bean plants, with
a higher amount of nodules and chlorophyll content than
non-inoculated plants (control).
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